Propping device for roofs of mine levels



1954 J. PERRIN ETAL 694,293

PROPPING DEVICE FOR ROOFS OF MINE LEVELS Filed May 8, 1955 2 Sheets-Sheet 1 Fig. 1.

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Unite Sttes Patent PROPPING DEVICE FOR ROOFS OF MINE LEVELS Jacques Perrin, Bethune, and Rubin Grinberg, Paris, France, assignors to Societe DEtudes Hydrauliques Pour LIndustrie Miniere (S. E. H. I. M.), Puteaux, France, a French company Application May 8, 1953, Serial No. 353,786

7 Claims. (Cl. 61-45) The present invention relates to a propping device for roofs of mine levels.

It has more particularly for an object a device such as defined designed to be progressively displaced while still ensuring its propping function.

The device object of this invention, is characterised by the fact that. it includes at least two vertical extensible supports, such as jacks, each of which is capable to support by itself the total load of the supported part of roof when the other is inoperative, these supports being provided with means permitting them to move respectively to each other along the mine level.

Other characteristics and advantages of the invention will appear throughout the following specification, which, referring to the appended drawings, given'as nonlimitative examples, will help to understand how the present invention may be carried out into practice, the particulars standing out both from the text and from the drawings being, of course, included in the invention.

Figure 1 shows in elevation a propping device according to the invention.

Figure 2 is a work diagram.

Figures 3 to 9 relate to the different positions after the movements corresponding to the diagram of Figure 2. Figure 10 is a sectional view of a rotary distributor.

On figures, l and 2 are the elements of a structure supporting the mine level roof, 3 and 4 are sole elements which bear hold on the ground.

These various elements are adequately shaped so that those insuring a same function will fit telescopically into each other in order to prop more or less extensively the mine level in a longitudinal direction.

By way of example, these elements may be tubular, rectangular, or have a U shaped section.

By principle, the sole is shorter than the frame, so as to leave free a maximum amount of space for the operation of the coal-cutter.

Between the frame and the sole are interposed jacks 5 and 6, preferably hydraulic, placed vertically.

Jack 5 is integral with elements 2 and 4 and jack 6 with elements 1 and 2. v

In order to allow the piston 5a of the jack 5 to be fixed to the inner telescopic element 1, a passage 2a is provided in the lower Wall of element 2.

Similarly a passage 3a is provided in the upper plate of the sole element 3- so as to make a passage for the foot of jack 5 which is integral with the inner element 4.

Piston 5a is fitted with a collar piece 50 on which bears the inner face of the lower wall of element 2.

Identically the foot of jack 5 is fitted with a collar piece 5b adjacent to the upper face of the upper plate of element 3.

At least one jack 7 enables to adjust the distance between 3 and 4 and, accordingly between 6 and 5, and by corollary between 1 and 2. v

To the body of the jack 7 is or are fixed one or a 2,694,293 Patented Nov. 16, 1954 head 8d in the slot 7b until the moment when this head will strike the end of the said slot, the second part of the stroke tending then to push element 3 away from cylinder 7 and, accordingly, from element 4. An arrangement of this type permits to obtain a delay in the effective work of jack 7.

It will be seen upon examining the work diagram (Figure 2), the advantages which derive from this delay. In fact, it is possible to place jack 7 under the hydraulic dependance of jacks 5 and 6, that is to say connect each end of the cylinder to this jack 7 to the lower part of the adjacent jack, taking care to fit these lines with a valve permitting the fluid to pass only in the direction 5 towards 7, and 6 towards 7. the return of the fluid to the tank or pump being done directly.

Thus one end of jack 7 communicates with the lower part of jack 5 while the opposite part of this jack 7 communicates with the lower part of jack 6.

On Figures 3 to 9 are shown the different positions 9 after the movements corresponding to the diagram in Figure 2.

The cycle is as follows:

The two vertical jacks occupying their position of maximum extension, and elements 3 and 4 being as close to each other as possible (Fig. 3).

1st movemenht (Fig. 4).The pump is connected to the higher part 5b of the cylinder of jack 5, which will therefore come down. The fluid pushed back by piston 5d escapes from the cylinder by the canalisation connecting it to the cylinder of jack 7, tending to push back piston 7d.

Owing to the important inertia of elements 3 and 4, the bottom of the cylinder receives the pressure and forces the latter to draw nearer element 4. The head 8a of rod 8 travels in the slot 7h, up to the moment when it reaches the end opposite to the latter.

2nd movement (Fig. 5 ).Starting at this moment, the: cylinder '7 being propped against element 4, the dis- 1 placement of piston 5a causes piston 7d to slide into cylinder 7. Element 3 being immobilized owing to the extension of jack 6 which presses the frame and the sole against the roof and ground of the level, the motive action will result in the translation movement of the assembly, jack 7-element 4-element 2, that is, the desired forward movement towards the cutting front.

3rd movement (Fig. 6).-The pump is connected to the lower part 5b of jack 5, which extends until it reaches its point of maximum extension, the otherjacks remaining in their preceding position.

4th movement (Fig. 7).--The pump is connected to the higher part 6h of jack 6, pushing backpiston 60 causing thereby element 1"to go down. The fluid chased by the jack forces the body of jack 7 to draw nearer element 3, the head 8a travelling in the rear 7b in a direction opposite to that in the preceding movement.

5th movement (Fig. 8).Piston 6a continues its down stroke. the slot, the motive force on the face of the piston 7n causes element 3 to draw near jacket 7.

forming slot to a roller head 8a adapted to slide into the latter. This roller head forms the end of a rod 8 the other end of which is fixed for instance by a joint 8b to a vertical transverse plate 4a of the inner element 4 of the sole.

Rod 70 of piston 7d of jack 7 extends through the opposite bottom plate of cylinder 7 and is fixed to a vertical wall 3d placed transversally to element 3.

Jack 7 can move respectively both to elements 3 and elements 4. sliding on. the inner face 30 of the sole 3;

6th movement (Fig. 9).-The pump being connected now to the lower part 6b of jack 6, the latter rises and element 1 ensures its propping function.

The cycle can now begin again.

Naturally, the fluid may be directed to the various parts of the cylinders by means of adequate distributors of known conception but totally or partially hydraulic types will be preferred.

Figure 10, for instance, shows a sectional view of a rotary distributor controlled by an electric motor placed in a airtight case, remotely controlled by a commutator, the distributor automatically stopping after a 360 rotation.

When the head 8a strikes'the end 7b of i The, stator 10 accommodates a rotor 11 longitudinally traversed by an input canalisation 12 conducting the fluid from the pump. This canalisation 12 communicates through one of the ends of a radial canalisation 13 traversing the rotor diametrically with one of the four recesses 14 managed in the mass of the stator lady 620 and each connected to one of the inlets h, 5b,

The recesses are dimensioned so that they Wfll, proportionally to the output, displace the corresponding piston as desired. It will be observed that, for a 360 rotation, the distribution will occur alternately at 511, 5b, 6h, 6b. The cycle may then continue.

On Figure l have not been shown the pump, the distributor, nor the tank for the hydraulic fluid, if any.

The elements can be accommodated either in the rear casing of element 3 limited by the wall 3d, or in a casing disposed on the upper part of element 3.

It is to be understood, of course, that it is possible, without departing from the scope of the present invention to make any modifications to the forms of embodiment described above and in particular replace the rotary distributor by one or a plurality of slide box distributor or by any device permitting to obtain the same result.

What we claim is:

1. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first extensible support interposed between the outer element of said telescopic beam and of said telescopic sole and capable of supporting the load of the root" propped up by the outer element of said telescopic beam, and at least a second extensible support interposed between the inner elements of said telescopic beam and of said telescopic sole and capable of supporting the load of the roof propped up by the inner element of said telescopic beam, means for moving telescopic elements of beam and of sole and means for modifying the length of the extensible supports.

2. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is affixed to the outer element of said telescopic beam and the cylinder of said jack being affixed to the outer element of said sole, at least a second hydraulic jack. the piston of which is aflixed to the inner element of said telescopic beam and the cylinder of said second jack being afiixed to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, means for moving telescopic elements of said beam and of said sole.

3. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is afiixed to the outer element of said telescopic beam and the cylinder of said jack being affixed to the outer element of said sole, at least a second hydraulic jack, the piston of which is affixed to the inner element of said telescopic beam and the cylinder of said second jack being aflixed to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, at least a device acting as a hydraulic jack operating horizontally, the piston of which is coupled with the inner element of telescopic beam or sole, the cylinder of said horizontal jack being coupled with the outer element of telescopic beam or sole.

4. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is aflixed to the outer element of said telescopic beam and the cylinder of said jack being afiixed to the outer element of said sole, at least a second hydraulic jack, the piston of which is afiixed to the inner element of said telescopic beam and the cylinder of said second jack being afiixed .to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, at least a hydraulic jack operating horizontally, the piston of which is coupled with the inner element of telescopic beam or sole, the cylinder of said horizontal jack being coupled with the outer element of telescopic beam or sole, said cylinder of said horizontal jack sliding on the sole and communicating with at least a cylinder of a vertical jack.

5. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is aflixed to the outer element of said telescopic beam and the cylinder of said jack being affixed to the outer element of said sole, at least a second hydraulic jack, the piston of which is affixed to the inner element of said telescopic beam and the cylinder of said second jack being aifixed to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, at least a hydraulic jack operating horizontally, the piston of which is coupled with the inner element of telescopic beam or sole, the cylinder of said horizontal jack being coupled with the outer element of telescopic beam or sole, said cylinder of said horizontal jack sliding on the sole and having one of its ends communicating with the lower end of the first vertical jack cylinder and the other end communicating with the lower end of the second vertical jack cylinder.

6. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is affixed to the outer element of said telescopic beam and the cylinder of said jack being afiixed to the outer element of said sole, at least a second hydraulic jack, the piston of which is affixed to the inner element of said telescopic beam and the cylinder of said second jack being affixed to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, at least a hydraulic jack operating horizontally, the piston of which is coupled with the inner element of telescopic beam or sole, the cylinder of said horizontal jack being coupled with the outer element of telescopic beam or sole, said cylinder of said horizontal jack sliding on the sole and having one of its ends communicating with the lower end of the first vertical jack cylinder and the other end communicating with the lower end of the second vertical jack cylinder, said cylinder of said horizontal jack having externally at least a longitudinal plot appendix solid with said cylinder and pierced with a longitudinal slot in which slide the head of a bar the other end of wlllich is solid with inner element of telescopic beam or so e.

7. In a device for propping up mine galleries a beam placed under the roof and constituted by two telescopic elements, a sole placed on the floor of the gallery and constituted by two telescopic elements, at least a first hydraulic jack the piston of which is afiixed to the outer element of 'said telescopic beam and the cylinder of said jack being aflixed to the outer element of said sole, at least a second hydraulic jack, the piston of which is affixed to the inner element of said telescopic beam and the cylinder of said second jack being affixed to the inner element of said telescopic sole, a hydraulic pump and a hydraulic distributor directing adequately the hydraulic fluid toward the cylinders of said jacks, at least a hydraulic jack operating horizontally, the piston of which is coupled with the inner element of telescopic beam or sole, the cylinder of said horizontal jack being coupled with the outer element of telescopic beam or sole, said cylinder of said horizontal jack sliding on the sole and having one of its ends communicating with the lower end of the first vertical jack cylinder and the other end communicating with the lower end of the second vertical jack cylinder, said cylinder of said horizontal jack having externally at least a longitudinal plot appendix solid with said cylinder and pierced with a longitudinal slot in which slide the head of a bar the other end of which is solid with inner element of telescopic beam or sole, the piston tail of said horizontal jack being journalledwith the outerelement of telescopic beam or sole.

(References 011 following page) 2,694,298 5 6 References Cited in the file of this patent FOREIGN PATENTS UNITED STATES PATENTS Number Country Number Name Date 9 ,3 France 2,641,906 Knights June 16, 1953 5 2,644,311 Malloy July 7, 1953 Date 

